no revs on idle

[terminator2000]

i have ecomotive 60 plate car

should engine rev past 2500 in neutral
it revs past that in all gears when driving.

 

[Marshall]

Perfectly normal.
When the car isn't moving the revs are limited to this.

 

[MJ]

It has a static rev limiter.

 

[Nath.]

Its to stop you annoying your neighbors if they are on nights and sleeping during the day.

On a side note, how do they do a high rev smoke test on the MOT with this feature?

 

[MJ]

Its to stop you annoying your neighbors if they are on nights and sleeping during the day.

On a side note, how do they do a high rev smoke test on the MOT with this feature?

Most high end emission test equipment has an obd output that plugs into the diagnostic socket, this reads the RPM and coolant temps.

Before you run the smoke test the machine measures the idle and max engine speed when the vehicle is static, it stores the max speed and measures the smoke levels from idle to the maximum measured level it took before the test.

I've never had one fail the test using this method and the equipment is really the only way to carry out a fair smoke test as you can easily trick the machine if you don't use the obd readings.

 

[/dev/null]

You can get it to rev higher, can't remember how though. But why would you want to? Unfortunately, many people mistake this for launch control, which is most definitely isn't.

 

[Nath.]

Most high end emission test equipment has an obd output that plugs into the diagnostic socket, this reads the RPM and coolant temps.

Before you run the smoke test the machine measures the idle and max engine speed when the vehicle is static, it stores the max speed and measures the smoke levels from idle to the maximum measured level it took before the test.

I've never had one fail the test using this method and the equipment is really the only way to carry out a fair smoke test as you can easily trick the machine if you don't use the obd readings.

Ahh Ok, I thought the smoke test was done at max revs (about 5k) This is because I've heard diesels being revved up this high at MOT stations.

 

[MJ]

yeah you're right, if the max revs are measured at 5k then the test is taken from 5k but when they have the 2.5 limiter it only reads up to that point.

on most modern diesels the smoke tester doesnt even pick up a reading which is why the obd add on was put in place.

 

[betty_swollox]

Lollllllllllllllllllllllllllll